U1255 Code - Lost Communications
Quick Answer
Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Common causes include Loose control module connectors, Faulty control module, Control modules poor lectrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- U1255 indicates Lost Communications.
- Common causes
- Common causes include Loose control module connectors, Faulty control module, Control modules poor lectrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code U1255 Description
- Audio amplifier
- Cellular telephone module w/UV8
- Dash integration module (DIM)
- Digital radio receiver
- Driver door module (DDM)
- Driver door switch assembly (DDSA)
- Electronic brake control module (EBCM)
- Electronic suspension control module (ESC)
- Front passenger door module (FPDM)
- Inflatable restraint sensing and diagnostic module (SDM)
What are the Possible Causes of the DTC U1255?
- Loose control module connectors
- Faulty control module
- Control modules poor lectrical connection
- Control Modules harness open or shorted
How to Fix the DTC U1255?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
As with all loss of communication concerns, inspect the power, ground, and serial data circuits to the suspect module prior to replacing any parts.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the U1255 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Information for Specific Makes
- U1255 Buick — Lost Communications
- U1255 Cadillac — Lost Communications
- U1255 Chevrolet — Lost Communications
- U1255 GMC — Lost Communications
- U1255 Infiniti — Satellite Radio Turner Connection
- U1255 Nissan — Satellite Radio Turner Connection
Frequently Asked Questions about U1255 Code
1. What does the OBDII code U1255 mean?
U1255 indicates a loss of communication between modules on the vehicle's communication network, often related to the Controller Area Network (CAN) bus.
2. What are the common symptoms of code U1255?
Symptoms may include warning lights on the dashboard, erratic or inoperative gauges, failure of certain electronic systems, or intermittent loss of functionality.
3. What causes the U1255 code to appear?
Common causes include a faulty module, damaged wiring, a loose or corroded connector, or a failing communication bus.
4. Can a low battery cause the U1255 code?
Yes, a low or weak battery can disrupt module communication and trigger the U1255 code.
5. How do I diagnose code U1255?
Start by checking the battery voltage, inspecting wiring and connectors for damage, and verifying continuity in the communication network using a scan tool.
6. Can I drive with the U1255 code?
It depends on the affected systems. While some systems may remain operational, critical safety or performance-related features could be compromised.
7. What modules are typically affected by the U1255 code?
Any module on the communication bus can be involved, such as the ECM, TCM, ABS module, or BCM, depending on the vehicle.
8. How do I fix the U1255 code?
Repairs may include cleaning or securing connectors, repairing damaged wiring, replacing a faulty module, or reprogramming a module if necessary.
9. Is special equipment needed to troubleshoot the U1255 code?
Yes, a scan tool capable of reading manufacturer-specific data and analyzing the communication network is often required.
10. Can the U1255 code clear itself?
If the issue is intermittent, the code may clear temporarily, but the underlying problem must be addressed to prevent recurrence.
Discuss the causes and fixes for U1255 OBDII Code
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